Pulverulent-coal-feeding apparatus.



PATENTED AUG. 2

APPLICATION FILED MAE. 15. 1902.

N0 MODEL.

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lljjfnesses Mfmrig Y Patented August 2, .1904.

VILTSIE F. WYOLFE, OF 'NICY YORK, N. Y,

, ASSIGNOR TO PIC'IER B.

BRADLEY, (.)F BOSTON, )IASSACHUSETTS.

PULVERULENT-COAL-FEEDING APPARATUS.

SPECIFICATION forming part of Letters atent No, 766,407, dated August 2, 1904, Application filed March l5, 1902. Serial No. 98,284. No model.)

To /LZZ who/11, it 'mf/ry conc/'7714 Be it known that I, Tunisia F. llanura, a

citizen of the United States, residing at New York, in the county and State of New York,

have invented an improvement in lulverui lent-Coal-Fceding Apparatus, ot' which the following description, in connection with the accompanying' drawings, isa specilication, like letters on the drawings representing' like parts.

This invention relates to apparatus for feeding pulverulent or dust fuel to furnaces. particularly to furnaces employed for heating steam-generators and the like. ln apparatus of this class the pulverulent or dust fuel is ordinarily fed into or deposited in a suitable receptacle or hopper, from the bottom of which it is drawn in required quantity and delivered to the devices which project the same into the combustion-chamlier, and much diiliculty has heretofore been experienced in oliitainiug a uniform flow of the pulverulmitfuel from this hopper, because of frequently damp comlition of the fuel, which renders it liable to cake and arch in the hopper, which of course obstructs the flow.

My invention relates particularly to means for removing or delivering the fuel from the hopper to the devices which project it into the combastion-chamber, and the various features comprising my invention will be fully hereinafter described, in connection with the accompanying drawings, and specilically pointed out in thc claims.

ln the drawings, Figure l in side elevation. partial section, illustrates a pulverulcnt-fuclfeeding apparatus illustrating' one embodii ment of my invention; Fig. L), a vertical secg tional detail on .the dotted line 2 9, Fig. l; and Fig. 3, a perspective detail, on an enlarged scale, illustrating the foraminous hopper-bottom employed in Figs. l and Q.

In the embodinient of my invention selected for illustraticm herein and shown in the drawings the boiler-setting' A, provided with the fuel-induction opening' or door/1, the combustion-chamber at D. the hopper B2 for the pulverulent or dust fuel, the dellvery-chamber B, containing' the rotary delivering device (V, the

controlled passage-wayf/ between the hopper and the delivery-chaml)er B, with its controlling' gate or device n' and controlling-wheel shaft B, are and maybe of usual or desired constructioiv such, for-instance, as shown in Reissue Letters Patent to F. N. Spear, No. 11,964, dated January QS, 1902, wherein like letters represent like parts. lt should be understood, however, that while 1 have illustrated these part-s in correspondence with parts of the said Spear apparatus as a matter of convenience, yet my invention is not restricted thereto.

In accordance with one feature of my in ventiou l arrange at the bottom of the hopper and preferably immediately above the controlling gate or device f/f a movable foraminous bottom F. This foraminous bottom may be of suitable or desired construction. l have found it convenient to construct it as illustrated in Fig. 3, wherein it is shown as composed of a rectangular frame j" of substantially the same width as the bottom of the hopper and slightly shorter in length than said bottom to permit of a vibration thereof in said hopper, the said frame having its ends connected by longitudinal members f' to give rigidity to the structure, the whole being covered with a foraminous plate or netting fx. This bottom is provided with suitable means for vilnating 'or reciprocating it to cause the fuel resting upon it to sift down through to the delivery device (Y. As herein shown, the

s said foraminous bottom is suspended at its ends upon swinging links f", pivotally at' tachcd to the sides of the hopper, as at f, Fig. A connecting-rml j", jointed to the foraminous bottom f, is extended laterally through the inclosing case of the apparatus and is provided at its end with a roller or other stud f3. shown as engaging' the groove of the barrel-camff', fast on a cam-shaft, '7, geared in suitable manner, as by the wheels f f", to the shaft if of the delivery device (V, whereby rotation of the latter by suitable means (not shown) will cause correspomling and proportionate rotation of the camf and vibration or reciprocation of said foraminous bottom.

bination with suitable delivery means of a fuel-liopper therefor provided with a reciprocat-cry foraminous'bottom and loosening-spurs inclined in both directions of movement of For the purpose of additionally loosening l the fuel in the hopper immediately above the l said bottom I have provided the fi'ame niembers f' thereof with upwardly-extended and preferably-inclined spurs fw, which as the said bottoni. bottom reciprocates penetrate and loosen the Q. Inapulverulent-fuel-feed devicethe comfuel, causingv it to fall upon the bottom. In l bination with delivery means of apulverulentfact, the inclined arrangement of the said l fuel-supply hopper arranged above the same spurc enables tllgein to iperatle als positive fedand1 zommunifliatitng1 therewith, a bottom fi'r ing evices to orce tie 'ue town upon ie sait iopper at ap et o reciprocate in a ver isaid bottom. By suspending the said bottom cal and lateral direction, and loosening-spurs in swingingr links as shown the bottom not for said bottom. only hars ahhorizorital reciprocatory or vibral 3. Inapulverulent-fuel-feeddevice,the comtory movement, but it also has an apprecibination with delivery means of a fuel-supply able up-and-down movement, owing to the l hopper therefor, provided with a foraminous Short radius of the suspending' links. .This bottom mounted 'on short` links to swing enables the bottom to exert at each recipi'otherein with a rising-and-falling movement, cation an up-and-down or hammer movement loosening-spurs for said bottom, and actuatupon the mass of fuel above it tending to ing means therefor. loosen it and preventing its arching or cak- 4. In a pulverulent-fuel-feeding device, the ing. This is also true of any fuel that may combination of a hopper for holding a supply pass vdown and tend to arch below the bottom of pulverulent fuel, a delivery-chamber proand above the regulating device ci.

vided with mechanical delivery means for de- By employing a reciprocating foraminous livering the fuel `directly therefrom into the bottom the fuel is not only compelled to pass combustioii-chamber, a foi'aminous bottom to the delivery device in a finely-divided state, for said hopper and interposed between the but the pulverization immediately above the same and said delivery means, said bottom foraniinous bottom is induced by the relative being mounted on short links to thereby swing' movement between the bottom and the superwith the rising-and-falling movement, and acimposed mass of fuel, as well as by the hamtuating means for said swinging' foraminous mer movement upon the latter above referred bottom. to. There is consequently at each recipi'oca- 5. In apulverulent-fuel-feeding device, the tion of the hopper-bottom a deposition of combination of a hopper for holding a supply finely-divided fuel evenly distributed over the of pulverulent fuel, a delivery-chamber pro rotary delivery device, which materially aids vided with mechanical delivery means for detlie latter in the delivery of the fuel to the livering the fuel directly therefrom into the combustion-chambei' in the most eflicient concombiistion-chamber, and a bottom for said dition, which obviously is a dust or cloudhopper interposed between the same and said like state. Furthermore, this delivery is imdelivery means and adapted to reciprocate in mediate and without opportunity for the a vertical and lateral direction. subsequent aggloinei'atioii of the separated 6. In a pulverulent-fuel-feeding device, the particles of fuel.v The area of the deposit of combination of a hopper for holdingasupply fuel affected by the foraminous bottom may of pulverulent fuel and a delivery-chamber obviously be equal to the ai'ea of the latter,

provided with mechanical delivery means for or may be suitably diminished by adjustment delivering the fuel directly therefrom into the of the controlling-gate ai. On the other hand,

combustion-chamber, said hopper being' prothe peculiar movements imparted to the botvided with a swinging foraininoiis bottom, tom, whether with or without additional dehaving inclined spurs thereupon for feeding vices-such as the spurs f1", referred to#ef to sai/d delivery means a distributed supply of fectually prevent arching or caking of the piilvei'ulent fuel. fuel, such as would prevent a continuous feed 7. Iii a pulverulent-fuel-feeding device, the thereof to the delivery device. Shields /L procombination of a hopper for holding a supply ject inward from the ends `of the hopper sufof pulverulent fuel, a delivery-chamber prociently to prevent the fuel sliding through vided with mechanical delivery means for de to the delivery device past the ends of the relivering the fuel directly therefrom into the ciprocating bottom. combustion-chamber, said hopper being pro- My invention is not limited to the particuvided with a movable foiaminous bottom to lar embodiment thereof here shown and defeed directly to said delivery means a distribsci'ibed, as the same obviously may be varied utedY supply of pulverulent fuel, and controlwithin the spirit and scope of the invention. ling means to control the passage-way leading Having described my invention, and withfrom said foraminous bottom to said delivery out limitingI myself in the matter of details,

means. l what I claim, and desire to secure by Letters 8. In a pulverulent-fuel-feeding device the Patent, is-

combination of a hopper for holding a supply 1 In a pulverulentffuel-feed device,tliel comof pulverulent fuel and a delivery-chamber IOO ISO

provided with mechanical delivery means for deliverinl the fuel directly therefrom into the combustirin-chamber, said hopper being' provided with a foraminous bottom mounted to swingl therein and to feed directly to said mechanical delivery means a distributed supply of pulverulent fuel.

9. In a pnlverulent-fuel-feeding device, the combination of a hopper for holding a supply of pulverulent fuel, a delivery-chamber provided with mechanical delivery means for delivering the fuel directly therefrom into the combustion-chaniber, and one or more swing'- ing' devices in the bottom of said hopper and interposed between the fuel therein and said delivery means to control the feed therefrom to said delivery means and deliver thereto a distributed verulent fuel.

of fuel directly supply of pul- 10. ln a pulverulent-fuel-feeding device the combination with a supply-hop per for holding' f a supply of pulverulent fuel, of a deliverychamber provided with suitable mechanical delivery means for delivering' fuel directly therefrom into the combustion-chamber, and transversely-reeiprocating means in or adjacent the bottoni 0f said hopper and interposed between the same and said delivery means for delivering' during' reciprocation directly to said mechanical delivery means a supply of pulverulent fuel.A

In testimony whereof I have signed my name to this specification in the presence of two subscribing' witnesses.

YILTSIE F. VOLFE. lVitnesses: Fiumicino/K L. EMERY, Evnnn'r'r S. EMERY. 

